[turbofan] Add alignment parameter to StackSlot operator

src/compiler/instruction-selector.cc

Index: src/compiler/instruction-selector.cc
diff --git a/src/compiler/instruction-selector.cc b/src/compiler/instruction-selector.cc
index 14905aa016a1067ca9832fd724ff125f1e4b4101..279ac636c844a5b6ce94f17aceaf87f570a81759 100644
--- a/src/compiler/instruction-selector.cc
+++ b/src/compiler/instruction-selector.cc
@@ -1888,12 +1888,14 @@ void InstructionSelector::EmitLookupSwitch(const SwitchInfo& sw,
 }
 
 void InstructionSelector::VisitStackSlot(Node* node) {

[ahaas, 2017/04/24 11:43:54]

Can you move this code to platform-specific code? This CL could make the stack
frames of other platforms bigger than necessary, as far as I understand the
code.

[ivica.bogosavljevic, 2017/04/27 13:56:56]

Acknowledged.

-  int size = StackSlotSizeOf(node->op());
-  int slot = frame_->AllocateSpillSlot(size);
+  StackSlotRepresentation rep = StackSlotRepresentationOf(node->op());
+  int alignment = rep.alignment();
+  int slot = frame_->AllocateSpillSlot(rep.size(), alignment);
   OperandGenerator g(this);
 
   Emit(kArchStackSlot, g.DefineAsRegister(node),
-       sequence()->AddImmediate(Constant(slot)), 0, nullptr);
+       sequence()->AddImmediate(Constant(slot)),
+       sequence()->AddImmediate(Constant(alignment)), 0, nullptr);
 }
 
 void InstructionSelector::VisitBitcastTaggedToWord(Node* node) {